(;
AB[pd][qi][oi][pl][pc]
AW[ok][pk][qk][pn][pp]
C[White to invade the upper right.

Source:
    Attack and Defense, Ch. 7, p. 162
    Akira Ishida & James Davies, Ishi Press];
W[qg];B[og];W[qe]
LB[ri:A][of:B]
TR[qk][pk][ok]
C[A classic invasion sequence.  White holds A in reserve and threatens B to sandwich Black's group against the marked White wall.];
B[pe];W[rc]
(;
B[rb]
C[Actual game.];
W[rd];B[qb];W[ri];B[rj];W[ph];B[pi];W[rh];B[qj];W[rf]
LB[oh:A]
C[And White threatens A.]
)
    (;
    B[qd]
    C[Not good.];
    W[rd];B[qf];W[re];B[rf];W[qb]
    LB[rg:A][sf:B][ri:C]
    C[And White still threatens A, Black B, White C.]
    )
)

